Objectives To study the diagnostic value of transcranial dopplar (TCD) for artery-vein malformation (AVM).Methods The brain blood flow of 4 cases who clinic diagnose were not clear was determined with TCD.Results All of them showed characteristic changes of AVM--accelerating blood velocity,lower pulsatility index and spectrum disturbance.This coincided with the result of CT scanning and DSA.Conclusions TCD examination has advantages for AVM diagno...